JP7476395B2 - Portable terminal device and power transmission system - Google Patents

Description

The present invention relates to a mobile terminal device and a power transmission system .

The following technologies are known as wireless power supply technologies for mobile terminal devices: Patent Document 1 discloses a wireless power transmission system for wirelessly charging and/or supplying main power to electronic and electric devices via microwave energy, and Patent Document 2 discloses a system and method for optimally delivering pulsed wireless power using a transmitter assembly that is useful for optimizing the delivery of wireless power to multiple receivers.

JP 2017-139954 A JP 2016-512677 A

In Patent Document 1, wireless power supply from a wireless power supply device to a mobile terminal device is limited to wireless power supply from the wireless power supply device, and if a mobile terminal device requires wireless power supply and is located at a distance greater than the distance at which the wireless power supply device can supply power, power cannot be supplied to the mobile terminal device. In addition, in Patent Document 1, electromagnetic waves of at least one frequency are used to wirelessly supply power from the wireless power supply device to the mobile terminal device. When power supply is required to multiple mobile terminal devices, as in Patent Document 2, power is supplied to each mobile terminal device by changing at least one of the transmission phase, frequency, timing, amplitude, and direction.

However, the number of frequency bands that can be used by one wireless power supply device is limited, and when power supply is requested for a number of mobile terminal devices exceeding this number, there is a problem that some mobile terminal devices will not be powered. If this problem is addressed by increasing the number of devices dedicated to wireless power supply, there is a problem that the cost of the wireless power supply device will increase. In particular, in recent years, the same user may use a smartphone and at least one wearable terminal that operates in a subordinate manner thereto, and if each mobile terminal device requests power supply from the same wireless power supply device, there is a concern that the wireless power supply device will run out of resources such as frequency bands.

The present invention has been made in consideration of the above-mentioned circumstances, and has an object to minimize the time that the resources of a wireless power supply device are occupied by a specific user when wirelessly supplying power to a mobile terminal device, and to facilitate sharing of the resources by multiple people.

As one example of the present invention, the present invention is a portable terminal device comprising: a communication device that communicates with at least one or more subordinate portable terminal devices that operate according to control from the portable terminal device, and other portable terminal devices ; a battery; and a control device, wherein when the communication device receives a power supply request signal from the subordinate portable terminal device , the control device detects a remaining battery charge in the battery , and the power supply request signal includes a requested amount of power requested by the subordinate portable terminal device, and the control device calculates the remaining battery charge and the requested amount of power, and a control signal for power transmission to the subordinate portable terminal device. The control device determines whether or not power can be transmitted to the dependent portable terminal device based on the result of a comparison with a power supply allowable lower limit value for determining whether or not power can be transmitted to the dependent portable terminal device, and if it determines that power transmission from the portable terminal device is possible, it controls the dependent portable terminal device to transmit an amount of power corresponding to the requested amount of power, and if it determines that power transmission from the portable terminal device is not possible, it searches for other portable terminal devices that are capable of transmitting power, and controls the other portable terminal devices to instruct them to transmit an amount of power corresponding to the requested amount of power to the dependent portable terminal device from the other portable terminal devices found that are capable of transmitting power.

According to the present invention, when wirelessly supplying power to a mobile terminal device, the time during which the resources of the wireless power supply device are occupied by a specific user can be reduced as much as possible, and the resources can be easily shared by multiple people. Objects, configurations, and effects other than those described above will be made clear in the following description.

Diagram showing the outline of the wireless power supply system Functional block diagram of main mobile terminal device (A0) Schematic diagram of the dependent mobile terminal device (A1) A flowchart showing the process flow from power supply request to charging in A1. A flowchart showing the flow of processing from a power supply request to power transmission in A0 FIG. 13 is a diagram showing a sequence of sending a power supply request and charging to A0 from A1. FIG. 1 shows a sequence for transmitting the transmittable amount of electricity. A flowchart showing a wireless power supply device search process executed by A0 FIG. 13 is a diagram showing a power supply mode in a second embodiment. FIG. 13 is a diagram showing a power supply mode in a second embodiment. FIG. 13 is a diagram showing a power supply request and charging sequence in the second embodiment. FIG. 13 is a diagram showing a power supply request and charging sequence in the second embodiment. FIG. 13 is a diagram showing a power supply mode according to a third embodiment; A flowchart showing the process of the subordinate portable terminal device B1 of group B requesting power supply. A flowchart showing the process of the main mobile terminal device B0 of group B requesting power supply. A flowchart showing the process of the main mobile terminal device A0 of group A that is requested to supply power. FIG. 13 is a diagram showing a sequence of a power supply request and a response process between groups A and B. Diagram showing the flow of power in each case of wireless power transfer between groups FIG. 13 is a diagram showing a power supply mode in a third embodiment. FIG. 13 is a diagram showing a power supply mode in a third embodiment. FIG. 13 is a diagram showing a power supply mode in a third embodiment. FIG. 13 is a diagram showing an overview of the power supply relationship between each group and a wireless power supply device in the fourth embodiment. FIG. 13 is a diagram showing a power supply sequence in the fourth embodiment.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The same components and steps are designated by the same reference numerals throughout the drawings, and duplicated explanations will be omitted. Hereinafter, an embodiment of a mobile terminal device and a wireless power transmission method using the same according to the present invention will be described.

First Embodiment
1 is a diagram showing an overview of a wireless power supply system 1. The wireless power supply system 1 is a system in which a master mobile terminal device (hereinafter referred to as "A0") constituting a group A of mobile terminal devices and at least one or more subordinate mobile terminal devices (hereinafter referred to as "A1, A2") that perform device-to-device communication with A0 form one group A, and A0 transmits electromagnetic waves (wireless power supply radio waves) 41, 42 to A1 and A2 to supply (transmit) power to A1 and A2.

A0 is, for example, a smartphone or a tablet terminal. A1 is, for example, a wireless earphone, and A2 is, for example, a smart watch. Other examples of the subordinate mobile terminal device include:
It may be a wearable device such as smart glasses, and any type of device may be used as long as it operates by receiving a control signal from A0 via device-to-device communications 31, 32 with A0 as the master.

The communication method for the device-to-device communications 31 and 32 may be, for example, Bluetooth (registered trademark). Furthermore, the presence or absence of a group relationship is determined by the communication between A0 and A1,
A2 may be determined based on whether or not pairing has been established between the two devices.

The dedicated wireless power supply device 51 is capable of supplying power wirelessly.
A0 is a wireless base station of a mobile communication system, for example, a fifth generation mobile communication system (5G), and is capable of supplying power by wireless power supply equivalent to the dedicated wireless power supply device 51.
The wireless power supply device 50 receives electromagnetic waves 61 and 62 from at least one power supply destination, such as the dedicated wireless power supply device 51 and a wireless base station 52, and is supplied with power. Alternatively, the wireless power supply device 50 may be charged by receiving power from an AC adapter 115 (see FIG. 2).

Group A has a star structure in which A0 is responsible for control within group A, and A1 and A2 communicate through A0.

FIG. 2 is a functional block diagram of the A0. The A0 includes a first communication device 101 and a second communication device 102.
and a third communication device 103 which is an inter-device communication device, a ROM 105a, a RAM 105b, a sensor 106, a camera 107, a microphone 108, a speaker 109, a display 110, an LED 1
11, a power receiving control circuit 112, and a power transmission control circuit 113, and each of these elements is a control device 104
is connected to.

Each of the first communication device 101, the second communication device 102, and the third communication device 103 has a first antenna 10
1a, the second antenna 102a, and the third antenna 103a, and the first antenna switch (
SW 101b, second antenna SW 102b, and third antenna SW 103b,
The wireless communication device includes a wireless IC 101c, a second wireless IC 102c, and a third wireless IC 103c.

The first communication device 101 is used for millimeter wave band wireless communication. The second communication device 102 is used for microwave band wireless communication. The third communication device 103 is used for microwave band wireless communication or millimeter wave band wireless communication. The first communication device 101 and the second communication device 102 perform wireless communication with a base station of a mobile communication system such as a fifth generation mobile communication system (5G), among other wireless communication devices. Therefore, the dedicated wireless power supply device 51 corresponds to a mobile communication system communication device. Furthermore, the first communication device 101 and the second communication device 102 receive or transmit power using electromagnetic waves by switching an internal antenna switch. Therefore,
The first communication device 101 and the second communication device 102 correspond to external communication devices that receive electromagnetic waves (wireless power supply radio waves). The third communication device 103 is a device that uses wireless communication such as Wi-Fi (registered trademark), WiG, etc.
ig (registered trademark), Bluetooth (registered trademark), or other wireless communication is performed.
There may be a plurality of third communication devices 103. Thus, the third communication device 103 functions as a wireless communication device.

It may be configured using three pieces of hardware, the first communication device 101, the second communication device 102, and the third communication device 103. Also, the hardware of the second communication device 102 and the third communication device 103 may be common and operated by changing the control logic. In this case, A0 includes two communication devices, the first communication device 101 and the second communication device 102, as hardware, and operates using the three communication devices as control logic.

The A0 further includes a battery 114. The power receiving control circuit 112 charges the battery 114. The power receiving control circuit 112 also receives power from an AC adapter 115 via a commercial power source.

The power transmission control circuit 113 takes power from the battery 114 and transmits it to the first communication device 101 or the second communication device 102.
Electromagnetic waves (radio waves) are transmitted from the communication device 102 to supply power to A1.

The control device 104 is, for example, a CPU (Central Processing Unit
) is used to load a control program stored in the ROM 105a into the RAM 105b and execute it, thereby forming the following functional elements.

The control device 104 includes a communication control unit 104a for controlling communication with other portable terminal devices, a power control unit 104b for controlling the power of A0, and a first antenna SW 101b, a second antenna SW 102b, and a third antenna SW 103b based on information such as the communication frequency from the communication control unit 104a.
3b; a wireless power supply device searching unit 104d that searches for a dedicated wireless power supply device 51 or a mobile terminal device with a power supply function in the vicinity; a terminal position information acquiring unit 104e that acquires position information of a dedicated wireless power supply device 51 or a mobile terminal device with a power supply function in the vicinity and transmits it to other mobile terminal devices; a terminal group information managing unit 104f that manages device information such as battery capacity and functions of wireless terminals in group A to which A0 itself belongs, as well as current information such as remaining power, position information, and frequency information used, as well as similar information regarding wireless terminals that have communicated outside the group; and a control managing unit 104g that performs overall control of the main mobile terminal device A0.

3 is a schematic diagram of the A1. The A1 is a mobile terminal device that has a power receiving function but does not have a power transmitting function. In the second and subsequent embodiments described later, the A1 also has a power transmitting function.

The basic configuration of A1 is the same as that of A0, but differs in that it does not have a power transmission control circuit 113. Therefore, A1 can only receive power from the dedicated wireless power supply device 51 and A0 in the vicinity, and cannot supply power to A0.

A process in which A1, which is part of group A, has a power shortage and is supplied with power from A0 will be described with reference to Fig. 4 to Fig. 6. Fig. 4 is a flowchart showing the process flow from a power supply request to charging in A1. Fig. 5 is a flowchart showing the process flow from a power supply request to power transmission in A0. Fig. 6 is a diagram showing the sequence in which A1 requests power supply to A0 and charges it.

Based on the terminal group information management unit 204e of the control device 204, A1 transmits a power supply request notification, the location information of A1, and the required power amount P_A1 to A0, which is in charge of control within group A (S
401), and A0 receives it (S501).

The terminal group information management unit 104f of A0 receives the location information of A1 and the required power amount P_A1 as follows:
The data is stored in the RAM 106b.

Next, A0 transmits a reception notification of the power supply request notification to A1 (S502), which is received by A1 (S402).

Furthermore, A0 transmits a standby command to A1 (S503), and A1 receives it (S403
), and transitions to a standby state (S404).

The power control unit 104b of A0 checks the remaining battery power PB (S504) and determines whether wireless power supply of the required power P_A1 previously received from A1 is possible.
It is determined whether the difference with A1 is higher than the amount of power (lower limit of permissible power supply) Pth required for the operation of A0 (S505).

The allowable power supply lower limit value Pth may be the amount of power guaranteed for operation of A0, or may be a value equal to or greater than that.

If the remaining power PB-P_A1 of A0 after supplying power to A1 is higher than the allowable power supply lower limit Pth (S505/Yes), it is determined that wireless power supply to A1 is possible, and a power supply availability notification is sent to A1 (S506), which is received by A1 (S405/Yes).

Next, A0 transmits a power supply start notification to A1 (S507), and A1 receives it (S40
6).

A0 starts transmitting power (S508), and A1 starts receiving power (S407).

The power control unit 204b of A1 periodically reads the battery terminal voltage VB during power supply (S4
08), it is determined whether the battery terminal voltage VB has exceeded a required voltage value (charge determination threshold) Vth (S409). If it has exceeded the charge determination threshold Vth (S409/Yes), it is determined that charging is complete (S410), and a charge completion notification is sent to A0 (S411).

When A0 receives a charging completion notification from A1 (S509), A0 stops transmitting power to A1 (S510) and completes the charging process (S412).

On the other hand, in step S505, the remaining power of A0 after supplying to A1 is PB-P_A1
If is equal to or less than the power supply allowable lower limit value Pth (S505/No), the process of transmitting the entire amount of requested power from A1 is not possible, so an alternative process consisting of a power transmission process of the transmittable amount or a wireless power supply device search process described below is executed (S521).

<Transmission processing of transmittable amount of electricity>
In the process shown in FIG. 4 to FIG. 6, when A1 receives the transmittable power amount of A0, which is the power transmission source, A1 transmits a completion notification to A0, which is the power transmission source.

However, the remaining capacity of the battery 114 of A0 is not always sufficient to satisfy the power request from A1, so as an alternative process, only the transmittable amount of power may be transmitted.

FIG. 7 is a diagram showing a sequence for transmitting the transmittable amount of power. As shown in FIG. 7, even if the entire amount of the requested power of A1 cannot be transmitted, the transmittable power may be calculated, and the charging process may be completed when the power transmission from A0 is completed. In this case, if the result of the determination in step S505 in FIG. 5 is negative, the power control unit 104b calculates the transmittable power calculated by the power transmission source A0, for example, (battery remaining amount PB-requested power amount P_A1 of A1). If the value of (battery remaining amount PB-requested power amount P_A1 of A1) exceeds the allowable power supply lower limit value Pth, in step S506, the transmittable power is notified to A1 to transmit, and a power transmission start notification is transmitted (S507). Then, the control device 104 outputs a power transmission instruction signal to the power transmission control circuit 113, and starts power transmission (S508).
In this embodiment, the permissible power supply lower limit Pth is the amount of power required for the operation of the terminal A0.

When the power control unit 104b has completed transmission of the power equivalent to the transmittable power, it transmits a power transmission completion notification to A1, and the charging process is then completed.

<Wireless power supply device search process>
In the process (S505) in which A0 judges whether wireless power supply to A1 is possible, P
When B-P_A1 is lower than the permissible power supply lower limit value Pth, A0 may keep A1 on standby and search for another wireless power supply device (S521).

Figure 8 is a flowchart showing the wireless power supply device search process executed by A0.

The wireless power supply device searching unit 104d of the A0 searches for a wireless power supply device (dedicated wireless power supply device) that can be paired (S801). For example, the communication control unit 104a activates the ad-hoc mode of Wi-Fi (registered trademark) of the third communication device 103 to perform a search for a wireless power supply device by wireless communication. Alternatively, the communication control unit 104a activates the ad-hoc mode of the first communication device 101 or the second communication device 102 to perform a search for a wireless power supply device by wireless communication.
Alternatively, the wireless power supply device searching unit 104d may search for a wireless power supply device via a mobile communication system such as 5G using the above method. When the wireless power supply device searching unit 104d has found a wireless power supply device (Yes in S801), the wireless power supply device searching unit 104d transmits a power supply request to the found wireless power supply device (S802).

On the other hand, if the wireless power supply device searching unit 104d cannot search for a wireless power supply device (S801
/No) transmits a power supply request to the wireless base station (S807).

The antenna control unit 104c checks the frequency used for wireless power supply with the wireless base station or the wireless power supply device, selects the first communication device 101 or the second communication device 102, and sets the first antenna switch 101b or the second antenna switch 102b to the power receiving control circuit side (S803
).

When pairing with the wireless base station or the discovered wireless power supply device is completed, the power control unit 104b receives electromagnetic waves from the first antenna 101a or the second antenna 102a, and the power reception control circuit 112 receives power. The received power is charged into the battery 114 (S804).

The power control unit 104b monitors the remaining amount of the battery 114, and when it determines that charging is complete (S805/Yes), it transmits a charging completion notification to the wireless base station or the wireless power supply device and ends power reception (S806). Until charging is complete (S805/No), it continues receiving electromagnetic waves.

Since it is expected that charges will be incurred for receiving power via a mobile communication system such as 5G, the following processing may be performed to minimize charges. That is, power reception may be started only when the remaining battery level is equal to or less than a predetermined power reception start threshold, and power reception may be stopped when the remaining battery level reaches a power reception stop threshold.

The power reception start threshold may be a value equal to or greater than the power supply allowable lower limit Pth, but is a value smaller than the power reception stop threshold. The power reception stop threshold may be a value smaller than the charge capacity of the battery 114, i.e., the value when fully charged, for example, 80% of the maximum power storage amount. This makes it possible to minimize power supply via 5G, which may be charged.

On the other hand, when the wireless power supply device is located at home, for example, no charge is incurred even if the wireless power supply device receives power, so it is not necessarily necessary to set a power reception start threshold value and a power reception stop threshold value.

According to this embodiment, when A1 needs to be powered, a power supply request is made to A0, and A0 supplies power to A1.
Since A0 and A1 are performing device-to-device communication, communication with the wireless power supplying device is not required when A1 receives power, and the frequency band used for power supply from the wireless power supplying device is not occupied.

For example, if a user owns multiple wearable devices such as smartphones, wireless earphones, and smartwatches, and each device communicates individually with a 5G base station (equivalent to a mobile radio base station) or a wireless power supply device, a frequency band is required for each device. However, according to this embodiment, a group is formed by the mobile terminal devices owned by the individual,
The ability to transmit wireless power within the system prevents a single user from monopolizing a limited frequency band multiple times, making it easier to transmit wireless power from a wireless power supply device or 5G base station to multiple users.

In the above embodiment, A0 executes the wireless power supply device search process as part of the processing in response to the power supply request from A1. However, the wireless power supply device search process may be executed depending on the remaining charge of A0's battery 114, regardless of the presence or absence of a power supply request.

For example, the power control unit 104b may monitor the remaining charge of the battery 114 of A0, and when it detects that the remaining charge of the battery has fallen to a threshold value (power reception start threshold) or less for determining the start of power reception, execute the wireless power supply device search process.

This allows the main portable terminal device AO to be powered with a necessary and sufficient remaining battery power when away from home, instead of being fully charged, and then fully charged when at home.

Second Embodiment
In the second embodiment, when the remaining battery charge of A0 is not enough to satisfy the power required by A1, the remaining battery charge of the other A0 in group A is used to finally supply power to A1.

9A and 9B are diagrams showing a power supply mode in the second embodiment. Fig. 10 and Fig. 11 are diagrams showing a power supply request and a charging sequence in the second embodiment.

FIG. 9A shows a state in which wireless power transmission is performed from A2 to A0, and then, after it is determined that wireless power supply from A0 to A1 is possible (S505, S506), power is supplied from A0 to A1.

Alternatively, as shown in FIG. 9B, A0 may transmit the location information of A1 stored in the memory of the terminal group information management unit 104f of A0 to A0, and power may be supplied directly from A2.

Furthermore, as shown in FIG. 10, A1 may receive power from a portable terminal device A2 to make up for the shortage of power supplied only from A0.

In this case, in step S505, if PB-P_A1 is lower than Pth, A
0 sends a battery remaining amount confirmation request and the location information of A1 to the portable terminal device A2 in group A.
Furthermore, the amount of power supply shortage from A0 to A1 is transmitted.

Upon receiving the notification, A0 checks the remaining battery power of A2 using the power control unit 204b.
Notify.

The power control unit 104b of A0 receives the remaining battery power of A2 from A0 and transfers it to A2.
The amount of power that can be supplied from A1 to A2 and from A2 to A1 is calculated.
2 to notify it of the amount of power supplied.

Then, A0 starts power supply to A1, A0 receives a notification from A1 that the supply of the required amount of power has been completed, and then A0 transmits a notification of the completion of power supply from A1 to A2. A2, which has received a notification of the completion of power transmission from A0 to A1 from A0, starts power supply to A1.

After receiving a predetermined amount of power, A1 transmits a power reception completion notification to A0. After receiving the power reception completion notification from A1, A0 transmits a completion notification to A2. When A2 receives the completion notification, A2 starts and completes power transmission to A1.

In the above, when A1 receives power from A0, A1 sends a completion notification to A0, and when A1 receives power from A2, A1 sends a completion notification to A2. When A1 receives the amount of transmittable power for each, a completion notification is sent to the power transmission source.

In FIG. 10, A1 notifies A0 of the completion of power reception, and A0 transmits a power transmission completion notification to A2. However, as shown in FIG. 11, A0 notifies A1 of the completion of power transmission, and A2
A0 may transmit a power transmission completion notification to the power transmission completion notification unit 114.

In addition, A0 transmits power to A1, followed by A2 transmitting power, but this order does not matter. Also, A0 and A2 may transmit power to A1 at the same time.

In the second embodiment, the communication network in group A has a star structure with A0 at the center, but the communication network in group A may have a mesh structure, a full-connect structure, or the like.

As described above, according to the present embodiment, it is possible to supply power to a mobile terminal device not only from a wireless power supply device dedicated to wireless power supply but also from other mobile terminal devices. This allows the load of the wireless power supply device dedicated to wireless power supply to be distributed to mobile terminal devices to which it can supply power, making it possible to reduce the number of wireless power supply devices dedicated to wireless power supply.

Third Embodiment
The third embodiment is an embodiment in which power is supplied between a plurality of groups of portable terminal devices.
FIG. 13 is a diagram showing a power supply mode according to the third embodiment.

For ease of explanation, Fig. 12 illustrates communication and power supply between two groups, Group A and Group B. The configuration of Group B is the same as that of Group A. The communication networks in each of Groups A and B have a star structure with A0 and B0 at the center.

Among the portable terminal devices constituting group B, a subordinate portable terminal device (hereinafter referred to as "B1") controlled by a master portable terminal device (hereinafter referred to as "B0") requests power supply, but
If there is no power to spare within group B, power must be sought from outside group B.

Fig. 13 is a flowchart showing the processing of a subordinate portable terminal device B1 of group B requesting power supply. Fig. 14 is a flowchart showing the processing of a master portable terminal device B0 of group B requesting power supply. Fig. 15 is a flowchart showing the processing of a master portable terminal device A0 of group A to which power supply is requested. Fig. 16 is a sequence diagram of a power supply request and response processing between groups A and B.

First, B1 issues a power supply request to B0 through device-to-device communication (S1301), which is received by B0 (S1401). Steps S1402 to S1421 are the same as those in the first embodiment, and therefore the description thereof will be omitted.

Since B0 and B2 already do not have enough power to supply to B1 (S1422/N
o), the wireless power supply device search unit 104d of B0 searches for a wireless power supply device outside group B based on the information of the terminal group information management unit 104f. At this time, for example, the communication control unit 104a
Thus, the third communication device 103 is operated in the ad-hoc mode of Wi-Fi (registered trademark) to search for a wireless power supply device through wireless communication 10ab.

When A0, which controls group A, is found by this search (S1422/Yes),
The terminal location information acquisition unit 104e of B0 and the terminal location information acquisition unit 104e of A0 exchange information from their respective terminal group information management units 104f, and B0 transmits a power supply request and required amount of power for B1 to A0 (S1423, S1501).

The power control unit 104b of A0 calculates the amount of power that can be transmitted and
Based on the location information acquired by terminal group information manager 104e, terminal group information manager 104f determines whether power transmission is possible (S1502, S1503).

If power transmission is possible (S1424/Yes), A0 notifies B0 that power transmission is possible, and
and B0 receives it (S1504).

B0 retransmits the terminal IDs and location information of B0 and B1 to A0 (S1425, 15
05). This makes it possible to grasp the relative positional relationship between the two.

The terminal ID can be used as, for example, billing information. The terminal ID and terminal location information may be obtained from a base station (not shown) of the wireless communication network of the portable terminal device. With this information, A0 transmits a power transmission approval request notification to B0 (S1506), and A0 receives it (S1426).

B0 transmits a power transmission approval notice from A0 to B1 (S1427), and B1 receives it (13
06).

B0 transmits a power transmission start approval notice (S1428), which is received by AO (S1507). Having received the power transmission start approval notice, A0 starts power transmission to B1 (S1307, S1508).
).

B1 reads the battery terminal voltage VB and receives power until VB exceeds a voltage value (charge determination threshold) Vth required for the operation of B1 (S1308, S1309). When VB exceeds Vth (S1309/Yes), B1 completes charging (S1310) and transmits a charge completion notification to B0 (S1311), which is received by B0 (S1429). Having received the charge completion notification from B1, B0 transmits a notification of the charge completion of B1 to A0 (S1430), which is received by A0 (S1431).
S1509), and A0 ends power transmission (S1510).

In addition, in the wireless power supply device search by B0, A0, which is in charge of control in group A, is accessed (S1423), and A0 judges whether power transmission is possible based on the amount of power that can be transmitted from A0 (S1503).
Alternatively, the determination may be made based on the total amount of power that can be transmitted from the portable terminal devices A1 and A2 other than A0 that can transmit power.

In the above, B1 transmits a completion notification to the power transmission source when B1 receives the transmittable amount of power transmitted from A0. In consideration of the power situation of the power transmission source, A0, which is the power transmission source, may stop transmitting power to B1 when it transmits the transmittable amount calculated by A0.

Fig. 17 is a diagram showing the flow of power in each case of wireless power transfer between groups. The cases described in Fig. 14 to Fig. 16 correspond to case 2-1 in Fig. 17.

In cases 1, 3, and 3-1, B0 issues a power supply request, and in cases 2 and 2-
Case 1, Case 4, Case 4-1, Case 4-2 and Case 4-3 are cases where B1 issues a power supply request.

In addition, the portable terminal device that transmits power is A0 in Case 1, Case 2, and Case 2-1.
In other cases, it is A1. If the communication network has a star structure, it is A1,
Although communication of B1 will always be via A0 and B0 with outside the group, the flow of power does not necessarily have to pass through A0 or B0, which are responsible for control within the group.
When compared with Case 4-3, direct power transmission from A1 to B1 in Case 4-1 is the most efficient.

In addition, when the wireless power supply device search unit 104d of the control device 104 of B0 searches for a wireless power supply device outside the group based on information from the terminal group information management unit 104f, the wireless power supply device 1800 dedicated to wireless power supply outside the group B may be used as shown in Fig. 18A. In the case of the wireless power supply device 1800 dedicated to wireless power supply outside the group B, B0, which is in charge of control within the group B, performs communication 1801bs with the wireless power supply device 1800, and B0 transmits power 1801bs.
It is also possible to receive 802bs and feed power from A0 to the subordinate portable terminal device A1 in group A.

18B, in communication 1801bs, B0 transmits the power to the wireless power supply device 180
Alternatively, the wireless power supplying apparatus 1800 may directly supply power to B1 by transmitting position information and the amount of required power to A0 and having B1 receive information related to power supply by the wireless power supplying apparatus 1800 via A0.

Furthermore, when the power control unit 104b, the terminal location information acquisition unit 104e, and the terminal group information management unit 104f of the control device 104 of B0 determine that the power required by B1 cannot be sufficiently satisfied by the power transmission from group A (for example, 20% or less of the required power), B0 searches for a wireless power supply device other than group A. For example, as shown in Fig. 19, B0 may access a portable terminal device C0 that is in charge of control in group C, and transmit power to B1 from a portable terminal device C1 that belongs to group C. In addition, the search for a wireless power supply device may be performed via a base station (not shown) of a wireless communication network of the portable terminal devices.

As described above, according to the present embodiment, it is possible to supply power to a mobile terminal device not only from a wireless power supply device dedicated to wireless power supply but also from other mobile terminal devices. This allows the load of the wireless power supply device dedicated to wireless power supply to be distributed to mobile terminal devices to which it can supply power, making it possible to reduce the number of wireless power supply devices dedicated to wireless power supply.

Fourth Embodiment
The fourth embodiment is an embodiment in which power is transmitted between groups when a plurality of groups receive power from a wireless power supply device dedicated to wireless power supply. Fig. 20 is a diagram showing an overview of the power supply relationship between each group and the wireless power supply device in the fourth embodiment. Fig. 21 is a diagram showing a power supply sequence in the fourth embodiment.

As shown in FIG. 20, there are groups A, B, and C of portable terminal devices, and a wireless power supply device 1800 dedicated to wireless power supply. Groups A and C are
It is on the opposite side of Group B, separated by 00.

It is assumed that the wireless power supply device 1800 transmits power to the main portable terminal device A0 of group A at a frequency fA and to the main portable terminal device B0 of group B at a frequency fB. In this state, as shown in FIG.
As shown in FIG. 1, C1 transmits a power supply request to C0 using the device-to-device communication 10c.

C0, which has received a power supply request from C1, uses the device-to-device communication 10c to send a power supply request reception notification and then a standby command to C1. The wireless power supply device search unit 104d of C0 searches for a wireless power supply device outside the group based on information from the terminal group information management unit 104f. At this time, for example, the communication control unit 104a activates the ad-hoc mode of Wi-Fi (registered trademark) of the third communication device to search for a wireless power supply device and finds the nearby wireless power supply device 1800.

C0 and the wireless power supplying apparatus 1800 exchange information stored in the terminal group information management unit with each other via wireless communication 10cs.

C0 makes a power supply request to the wireless power supply device 1800. However,
Since the power supply 10 has already transmitted power to A0 and B0 at frequencies fA and fB, respectively, the power supply 10 returns a refusal to transmit power to C0.

Next, the wireless power supply device search unit 104d of the control device 104 finds A0 and B0 based on information of the terminal group information management unit 104f. The terminal position information acquisition unit 104e included in each of A0, B0, and C0 exchanges information of the terminal group information management unit 104f included in each of them between C0 and A0, and between C0 and B0 via wireless communications 10ca and 10b. At the same time, C0 transmits the power supply request and required power amount of C1 to each of A0 and B0.

A0 and B0 calculate the amount of power that can be transmitted by the power control unit 104b, the terminal location information acquisition unit 104e, and the terminal group information management unit 104f of each control device 104, determine the frequency that can be used, and judge whether power transmission is possible.
The wireless power supply device 1800 transmits a notification of the availability of power transmission, the amount of available power transmission, and the power transmission frequency to the portable terminal device and the wireless power supply device 1800 that are responsible for control within other groups.

In the power transmission 1802ca from A0 to C1, the wireless power supply device 1
Since the wireless power supply device 1800 is located on the opposite side from group B, if the frequency fB used for power transmission 1802bs from the wireless power supply device 1800 to B0 is used, there will be no interference between this power transmission 1802bs and power transmission 1802as (frequency fA) from the wireless power supply device 1800 to A0, and therefore frequency utilization efficiency is improved in the area where the wireless power supply device 1800 dedicated to wireless power supply and the groups A, B, and C of mobile terminal devices are present.

For simplicity, only what A0 sent is shown in FIG. 21. C0 received this.
A0 retransmits the terminal IDs and location information of C0 and C1 to A0. This makes it possible to grasp the relative location relationship between the two, and the terminal IDs can be used as billing information. The terminal IDs and terminal location information may be obtained from a base station (not shown) of the wireless communication network of the portable terminal device. With this information, A0 sends a power transmission approval request notification to C0.
C0 transmits a power transmission approval notification from A0 to C1, and transmits a power transmission start approval notification to A0. A0, which has received the power transmission start approval notification, switches the antenna for the frequency fB band to the power transmission control circuit 113 side by the first antenna switch 101b or the second antenna switch 102b. C1 also switches the antenna for the frequency fB band to the power transmission control circuit 113 side by the first antenna switch 101b or the second antenna switch 102b.
b or the second antenna switch 102b to the power receiving control circuit 112. Then, power transmission from A0 to C1 starts.

When the power transmission source A0 transmits the calculated transmittable amount of power, A0 stops transmitting power to C1 and transmits a power transmission completion notice to C0. A0 and C1 switch the antenna switch for the frequency fB band to the first wireless IC 101c side or the second wireless IC 102c side.

The above description has been given of the case where no frequency interference occurs when performing inter-group power transmission. On the other hand, if frequency interference occurs when performing inter-group power transmission, different control can be performed. For example, the power control unit 104b, terminal position information acquisition unit 104e, and terminal group information management unit 104f of A0 calculate the amount of power that can be transmitted, determine the frequency that can be used, and transmit a power transmission availability notification, the amount of transmittable power, and the transmission frequency to the mobile terminal device and wireless power supply device 1800 that are responsible for control within the other group. At this point, the remaining amount of power that the wireless power supply device 1800 transmits to B0 is compared with the amount of power transmitted from A0 to C1. If, as a result of the comparison, the remaining amount of power that the wireless power supply device 1800 transmits to B0 is greater than the amount of power transmitted from A0 to C1 (
For example, 30% or more), it is also possible to control B0 to surrender the frequency fB for power transmission to C1. By performing such control, it is possible to secure a frequency for wireless power supply to a portable terminal device or a subordinate portable terminal device that has a higher need for charging.

According to this embodiment, it is possible to supply power to a mobile terminal device not only from the wireless power supply device 1800 dedicated to wireless power supply but also from other mobile terminal devices. This also distributes the load of the wireless power supply device 1800 dedicated to wireless power supply to the mobile terminal devices to which it can supply power, making it possible to reduce the number of wireless power supply devices 1800 dedicated to wireless power supply. Furthermore, by utilizing the positional relationship between multiple groups, it is possible to improve frequency utilization efficiency in an area where multiple groups exist.

The present invention should not be construed as being limited to the above-described embodiments. Modifications of the specific configurations within the scope of the present invention are included in the technical scope of the present invention without departing from the concept and spirit of the present invention.

For example, in the above description, for simplicity, only three mobile terminal devices are illustrated per group, but the number of mobile terminal devices per group is not limited to three. In general, a group X is made up of a mobile terminal device X0 that controls the group X and a mobile terminal device Xi (i=1, 2,
...), and within group X, a star-structured network is formed with X0 at the center. Of course, a group may be formed of only mobile terminal device X0. The mobile terminal device that controls group X may be determined by the user using, for example, the pairing function of Bluetooth (registered trademark), but it may also be determined by communication between mobile terminal devices in close proximity and based on information such as the terminal device ID, battery capacity, location information, remaining power, power receiving function, power transmitting function, power transmitting efficiency, and power receiving efficiency. For example, a mobile terminal device that has a power transmitting function, a power receiving function, wireless communication of various communication standards, and a large battery capacity may be the mobile terminal device that controls the group.

1: Wireless power supply system 31: Device-to-device communication 32: Device-to-device communication 41: Electromagnetic waves 42: Electromagnetic waves 51: Wireless power supply device 52: 5G base station 61: Electromagnetic waves 62: Electromagnetic waves A0: Portable terminal device A1: Subordinate portable terminal device A2: Portable terminal device

Claims (4)

A mobile terminal device,
a communication device that communicates with at least one or more subordinate portable terminal devices that operate under control of the portable terminal device, and with other portable terminal devices ;
A battery;
A control device,
When the communication device receives a power supply request signal from the dependent portable terminal device , the control device detects a remaining battery charge in the battery ,
the power supply request signal includes an amount of power requested by the dependent portable terminal device,
the control device determines whether or not power can be transmitted to the dependent portable terminal device based on a comparison result between the remaining battery charge and the requested amount of power and a power supply allowable lower limit value for determining whether or not power can be transmitted to the dependent portable terminal device;
The control device includes:
When it is determined that power can be transmitted from the portable terminal device , control is performed so that an amount of power corresponding to the requested amount of power is transmitted to the dependent portable terminal device;
When it is determined that power transmission from the portable terminal device is impossible, a search is performed for the other portable terminal device capable of transmitting power, and control is performed to instruct the other portable terminal device to transmit an amount of power corresponding to the requested amount of power to the dependent portable terminal device from the searched other portable terminal device capable of transmitting power.
A mobile terminal device comprising: 2. The mobile terminal device according to claim 1 ,
The communication device communicates with an external device;
When the control device cannot find another portable terminal device capable of transmitting power, the control device communicates with the external device and performs control so as to transmit an amount of power corresponding to the requested amount of power.
A mobile terminal device comprising: 1. A power transmission system comprising:
A mobile terminal device, at least one or more subordinate mobile terminal devices that operate under control of the mobile terminal device, and another mobile terminal device,
the dependent portable terminal device transmits a power supply request signal to the portable terminal device;
the power supply request signal includes an amount of power requested by the dependent portable terminal device,
the portable terminal device detects a remaining battery charge in the portable terminal device;
the portable terminal device determines whether or not power can be transmitted to the dependent portable terminal device based on a comparison result between the remaining battery charge and the required power amount and a power supply allowable lower limit value for determining whether or not power can be transmitted to the dependent portable terminal device;
The mobile terminal device
When it is determined that power transmission from the portable terminal device is possible, an amount of power corresponding to the requested amount of power is transmitted to the dependent portable terminal device;
when it is determined that power transmission from the portable terminal device is impossible, searching for the other portable terminal device capable of transmitting power, and performing communication to instruct the other portable terminal device to transmit an amount of power corresponding to the requested amount of power to the dependent portable terminal device from the other portable terminal device capable of transmitting power found;
A power transmission system comprising: The power transmission system according to claim 3 ,
The power transmission system includes an external device,
When the portable terminal device cannot find another portable terminal device capable of transmitting power, the portable terminal device communicates with the external device to transmit an amount of power corresponding to the requested amount of power;
the external device transmits to the dependent portable terminal device an amount of power corresponding to the requested amount of power;
A power transmission system comprising:

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